Bearing device with sensor and rolling bearing with sensor

ABSTRACT

The present invention relates to a bearing apparatus with a sensor and a rolling bearing with a sensor used to movers such as automobiles or railway carriers, facility machines of equipment, or machine tools. One of the embodiments comprises a sensor detecting conditions of the rolling bearing, a ring-shaped sensor cover housing the sensor therein and secured to a stationary-side bearing ring, and a ring shaped presser member secured to a bearing housing provided outside in a radius direction of the sensor cover, or secured to a shaft, and an opening portion is provided at a decided portion of the sensor cover, and projections standing toward a side of the presser member are furnished in the circumference of the opening portion, the presser member is defined with cutouts for inserting the projections, and the cutouts are arranged with the projections.

TECHNICAL FIELD

The present invention relates to a bearing apparatus with a sensor and arolling bearing with a sensor which are used to movers such asautomobiles or railway carriers, machines of equipment, or machinetools, and in particular to a bearing apparatus with a sensor (called as“sensor-bearing apparatus” hereafter) and a rolling bearing with asensor (called as “sensor-rolling bearing” hereafter) which are suitedto detecting speed of rotation, direction of rotation, or phases by useof a hole element or hole IC.

BACKGROUND ART

For example, nowadays in automobiles, control of anti-lock breakingsystem (ABS) or traction control system (TCS) have widely beenpracticed, and for the control, speed of rotation of wheels must beexactly detected. Therefore, speed of rotation (number of rotation) of arolling bearing rotatably supporting the wheels with respect to awinding device has been detected.

For detecting speed of rotation (number of rotation) of, the rollingbearing, there has much served the sensor-rolling bearing with arotating sensor installed nearly to the bearing. Namely, thesensor-rolling bearing performs detection of speed of rotation of thewheels in that a cylindrical magnet having many magnetic polesalternately arranged to a rotating side, detects a magnetic flux of themagnet rotating together with the wheels through a sensor using the holeelement or the hole IC provided to a stationary side.

The sensor-rolling bearing detects speed of the movers, not limiting tothe above mentioned automobiles but including those having the rotatingmembers of such as railway carriers, and the detection of the rotatingdirection has been also widely practiced. The sensor-rolling bearing hasbeen employed, in many kinds of machines of equipment, for detection ofrotation speed of a motor output shaft or that of pump.

In the industrial wide field, for detecting number of rotation of therotating members, that is, speed of rotation, or for detecting therotating direction or phases of rotation, the sensor-rolling bearing haswidely been used as the bearing of the rotating members.

The conventional sensor-rolling bearing is attached by mounting an outerring on a bearing housing. Therefore, owing to causes such as differencein thermal expansion, a space between the outer diameter of the outerring and the inner diameter of the bearing housing exceeds a permissiblevalue, and the outer ring follows rotation of the inner ring andsometimes rotates along the rotating direction of the inner ring.

When the outer ring rotates in response to the rotation of the innerring, a sensor cover mounted on the outer ring and a sensor housing alsorotate concurrently. Then, an input-output signal wire taken out outsidefrom the sensor cover and the sensor housing is effected with shearingforce, because it is taken out outside via a cutout groove defined in apresser cover fixed to the bearing housing. Therefore, when the outerring largely rotates by the rotation of the inner ring, the input-outputsignal wire might be broken.

Therefore, a bearing 600 with a rotating sensor (called as “rotatingsensor-bearing” or “sensor-bearing” hereafter) has been proposed asshown in FIGS. 23 and 24. In the rotating sensor-bearing 600, the sensorhousing 606 is provided in an outer diametrical face with whirl-stopmembers 606 a projecting toward a radius direction passing through thesensor cover 607 receiving a rotation sensor 605 therein. The rotatingsensor-bearing 600 is arranged with the whirl-stop members 606 a in acutout groove 609 a of a presser cover 609, thereby preventing the outerring 602 from rotating with the rotation of the inner ring 601 (forexample, Japanese Patent Laid Open No. 2002-213472).

However, the above mentioned conventional sensor-bearing apparatus 600is complicated in a structure of securing the whirl-stop members 606 aand the sensor cover 607, so that the productivity is low.

A sensor-bearing apparatus 630 has conventionally been known as shown inFIGS. 25 and 26. FIG. 25 is a whole cross sectional view showing thesensor-bearing apparatus, and FIG. 26 is a cross sectional view alongC-C line of the sensor-bearing apparatus of FIG. 25. The sensor-bearingapparatus 630 causes one end 641 of the sensor 640 to directly contact areference face 631 a of a stationary-side bearing ring 631, while itcauses cut-out faces 633 of a sensor holding element 632 to fixchamfered parts 642 of the sensor 640 in order to position the sensor640 (for example, Japanese Patent Laid Open No. 311740/1998).

The above mentioned conventional sensor-bearing apparatus 630 has beeninvolved with a problem that a connection output portion 634 or aconductor 635 are applied with external force or vibration, so that aposition of the sensor 640 is circumferentially dislocated. Then, anerror in output of the sensor 640 is probably caused by thecircumferential dislocation.

Therefore, the sensor-bearing apparatus 630 depends on resin insertionbetween the sensor holding element 632 and the reference face 631 a ofthe stationary-side bearing ring 631 for checking the circumferentialdislocation.

However, depending on the resin insertion, since a complicated processis required, there is a room for making improvement with respect toproduction process and cost-up, accordingly.

FIG. 27 is a cross sectional view of the element parts showing theconventional sensor-rolling bearing. This sensor-rolling bearing 700 isformed by securing a magnetically sensitive sensor 721 and a member 720to be detected such as a magnet to the outer ring 710 or the inner ring711.

The magnetically sensitive sensor 721 buried in a sensor carrier 723includes a beading fixture over a full length of a concave groove 716formed in an inner diametrical face of the outer ring via a sensorholding device 725. In addition, the member to be detected 720 isdisposed on a plane part in the radius direction of an L-shaped member722 forced in an outer diametrical face, so that the member 720 to bedetected faces to the sensor 721.

In the above mentioned conventional sensor-rolling bearing 700, if asize of the bearing is small in the diametrical direction, it isdifficult to secure the magnetically sensitive sensor 721 to the innerdiametrical face of the outer ring 710 via the sensor carrier 723. It isalso difficult to secure the member to be detected 720 to the outerdiametrical face 711 of the inner ring via the L-shaped member 722.

For solving this problem, as seeing FIGS. 28 and 29, it may be assumedto provide a step portion in the outer diameter of the outer ring or theinner ring in order to fix the sensor or the member to be detected. Butsince a face to be processed of the step portion can not be subjected toa centerless machining, sizes are largely dispersed, and it is difficultto force and fix respective members.

In general, the sensor-rolling bearing is very often disposed nearlymembers generating electric noises by a motor. Therefore, by disposinglocations, an external magnetic field caused by an external noisedisturbs a magnetic field formed by the member to be detected, so thatsuch probability might be caused that the sensor cannot exactly detectthe magnetic field formed by the member to be detected.

Further, the sensor-bearing apparatus 800 as shown in FIG. 30 is known.FIG. 30 is a cross sectional view of the element parts of theconventional sensor-bearing apparatus. As showing in the same, thesensor-bearing apparatus 800 is structured in that the magnetic sensor802 of the rotating sensor 801 and a pulsar ring (encoder) 803 areshielded with a sensor case fixing ring 804 of a magnetic substance anda magnetic bypath 805 so as to bypass an external leakage flux (forexample, Japanese Patent Laid Open No. 2002-174258).

As another embodiment of the conventional sensor-bearing apparatus 800,there are those shown in FIGS. 31 and 32. FIG. 31 is a whole crosssectional view of the element parts showing another example of theconventional sensor-bearing apparatus 800, and FIG. 32 is an upper(seeing from an upper side of FIG. 31) and partially plan view of FIG.31.

Referring to FIGS. 31 and 32, in the conventional sensor-bearing 850,the inner ring 852 at the right side of FIG. 31 of the rolling element853 is secured at the outer circumferential end with a core metal 856which is arranged with a cylindrical pulsar ring 857 of a permanentmagnet. The magnetic sensor 860 is placed within the sensor case 858leaving a space in relation with the outer circumferential face of thepulsar ring 857, while the sensor case 858 is fixed to an inside of asensor case fixing ring 861.

In regard to the sensor-bearing 850, the magnetic bypath 862 isfurnished to a further inside of the sensor case fixing ring 861 fixedto the outer ring 851 for interrupting the leakage magnetic flux flowingfrom a coil of the external motor into the magnetic sensor 860. Further,the sensor-bearing 850 is furnished with a side plate 863 and at thesame time with a cutout window 861 a at the upper part of a magneticsensor 860 in the sensor case fixing ring 861 for interrupting the loopof the leakage magnetic flux into the magnetic sensor 860.

However, the above mentioned conventional sensor-bearing 850 is disposedwith the magnetic sensor 860 such as hole elements via the pulsar ring857 and the space in the radius direction on the outer circumference ofthe cylindrical pulsar ring (magnet) 857 secured as projecting to theside of the inner ring 852. Therefore, for exactly detecting magneticchange of the rotating pulsar ring 857 by means of the magnetic sensor860, a surface part of the pulsar ring 857 opposite to the magneticsensor 860 necessitates a length larger than decided particularly in theaxial direction of the sensor-bearing 850.

Accordingly, the surface part of the pulsar ring 857 opposite to themagnetic sensor 860 cannot but project by the length larger than decidedin the axial direction of the sensor-bearing 850.

As a result, the above mentioned magnetic sensor 860 has a limitation inshortening the length in the axial direction of the sensor-bearing 850,and cannot satisfy a requirement for saving a space requested for usingthe sensor-bearing to many kinds of devices, including speed detectionof automobiles.

In addition, since the space between the pulsar ring 857 and themagnetic sensor 860 extends in the axial direction, a grease filled in avacancy of the bearing flows along the space in the axial direction, andis ready for running outside as it is, and therefore, an improvementhas, been demanded for.

Further, in case the leakage magnetic flux flows owing to an externalintense magnetic flux into between the inner ring 852 and the outer ring853 of the sensor-bearing 850, the magnetic flux leaks to a side of thepulsar ring 857 or the magnetic sensor 860 via the rolling element 853.It is therefore necessary to provide another member of a shielding platesuch as a magnetic bypath 862 between the sensor-bearing 850 and themagnetic sensor 860, increasing the number of parts and heighteningcost, and concurrently increasing a setting-up process. Besides, aninstalling space is required to restrain reduction in size.

It is accordingly an object of the invention to provide thesensor-bearing apparatus and the sensor-rolling bearing, which may bringabout high productivity and cost saving effect, position the sensoreasily and at high precision without requiring the complicated processas the formation of resin insertion, effectively bypass the leakagemagnetic flux from the outside with the less number of parts in order toavoid erroneous action of the sensor caused by electric noises of themotor, secure the requisite and enough whirl-stopping efficiency of thestationary-side bearing ring, and reduce in size by shortening thelength in the axial direction.

DISCLOSURE OF INVENTION

The above mentioned object of the invention can be accomplished by meansof the under mentioned structures.

(1) A bearing apparatus with a sensor, furnished with a rolling bearingincluding in that a plurality of rolling elements are incorporatedbetween a rotary-side bearing ring and a stationary-side bearing ring,

-   -   a sensor enabling to detect conditions of the rolling bearing,    -   a ring shaped sensor cover housing the sensor inward and secured        to the stationary-side bearing ring, and    -   a ring shaped presser member secured to a bearing housing or a        shaft provided outside in a radius direction of the sensor        cover,    -   wherein an opening is defined in a determined position of the        sensor cover, and is provided at its peripheral part with        projections standing toward the side of the presser member,    -   the presser member is formed with a cutout into which the        projections are inserted for restraining rotation of the sensor        cover.        (2) The bearing apparatus with a sensor as set forth in the        above (1), wherein a signal wire to be connected to the sensor        is inserted in the opening.        (3) The bearing apparatus with a sensor as set forth in the        above (1) or (2), wherein the projections are made by being bent        to project a slash formed in one part of the sensor cover in a        diametrical direction.        (4) In a rolling bearing structured in that a plurality of        rolling elements held in a holder are rotatably incorporated        between a pair of bearing rings,    -   a bearing apparatus with a sensor, comprising    -   a sensor for detecting conditions of a supported rotating shaft        or of the rolling bearing,    -   a ring shaped sensor cover secured to one end face in an axial        direction of a stationary-side bearing ring, and    -   a ring shaped sensor holding member secured to the sensor cover,    -   wherein the sensor is fitted in a sensor holding groove provided        in a determined position along a circumferential direction in        the sensor holding member with a determined tightening margin        owing to elastic deformation of the sensor holding member.        (5) The bearing apparatus with a sensor as set forth in the        above (4), wherein the sensor holding member is fitted inward of        the sensor cover with a determined space.        (6) The bearing apparatus with a sensor as set forth in the        above (4) or (5), wherein the sensor holding member is formed        with a plurality of positioning pins as projecting respectively        in the axial direction, leaving determined spaces in the        circumferential direction, and the sensor cover is formed with a        plurality of fitting holes in respective positions corresponding        to the plurality of positioning pins, and    -   the plurality of positioning pins are fitted in the plurality of        respectively corresponding fitting holes, whereby the sensor        cover and the sensor holding member are positioned.        (7) The bearing apparatus with a sensor as set forth in the        above (6), wherein the plurality of positioning pins are        respectively inserted in the plurality of fitting holes, and the        plurality of positioning pins passing through the plurality of        fitting holes are plastic-deformed at front ends, whereby the        sensor cover and the sensor holding member are fixed.        (8) The bearing apparatus with a sensor as set forth in the        above (6) or (7), wherein the plurality of fitting holes are        formed in the circumference with projections standing toward the        sensor holding member, and the sensor cover and the sensor        holding member are engaged by means of the projections only.        (9) The bearing apparatus with a sensor as set forth in anyone        of the above (6) to (8), wherein a circuit substrate of the        sensor is held between the sensor cover and the sensor holding        member, and the plurality of positioning pins of the sensor        holding member pass through holes provided in the corresponding        positions in the circuit substrate, and are inserted in the        fitting holes.        (10) In a rolling bearing structured in that a plurality of        rolling elements held in a holder are rotatably incorporated        between a pair of bearing rings, a bearing apparatus with a        sensor, comprising    -   a sensor for detecting conditions of a supported rotating shaft        or of a bearing,    -   a ring shaped sensor cover of a magnetic material secured to one        end face in an axial direction of a stationary-side bearing        ring,    -   a ring shaped sensor holding member of a non-magnetic material        holding the sensor inward under a condition of being secured        inward of the sensor cover, and    -   a conductive member installed as covering at least one part of        the sensor holding member and has an electromagnetic shield        effect.        (11) In a rolling bearing structured in that a plurality of        rolling elements held in a holder are rotatably incorporated        between a pair of bearing rings,    -   a bearing apparatus with a sensor, comprising    -   a sensor for detecting conditions of a supported rotating shaft        or of a bearing,    -   a ring shaped sensor cover of a conductive member having an        electromagnetic shielding effect secured to one end face in an        axial direction of a stationary-side bearing ring, and    -   a ring shaped sensor holding member of a non-magnetic material        holding the sensor inward under a condition of being secured        inward of the sensor cover.        (12) The bearing apparatus with a sensor or the rolling bearing        with a sensor as set forth in the above (10) or (11), wherein        the conductive member is provided as one body with the sensor        holding member.        (13) A rolling bearing with a sensor, comprising an inner ring,        an outer ring, rolling elements interposed between the inner        ring and the outer ring, a magnetic part to be detected provided        to one of the inner ring and the outer ring, and a magnetically        sensitive sensor provided to the other of the inner ring and the        outer ring and being opposite to the magnetic part to be        detected,    -   wherein any one of the magnetic part to be detected and the        magnetically sensitive sensor is secured to the inner ring or        the outer ring via an attaching member of a magnetic substance.        (14) The rolling bearing with a sensor as set forth in the above        (13), wherein the magnetic part to be detected is a ring shaped        multi-pole magnet of rare earth.        (15) The rolling bearing with a sensor as set forth in the        above (13) or (14), wherein the attaching member is fixedly        caulked in a concave groove formed in an outer diameter of the        inner ring or the outer diameter of the outer ring.        (16) The rolling bearing with a sensor as set forth in the above        (15), wherein the concave groove is formed in the circumference        along the outer diameter of the inner ring or the outer diameter        of the outer ring, and the attaching members are caulked in a        plurality of positions equidistantly along the circumference.        (17) The rolling bearing with a sensor as set forth in the above        (16), wherein the number of the caulking positions follows the        under mentioned formula,        (the number of the caulking positions)=nZ±X    -   herein,    -   n: positive integer    -   Z: the number of the rolling elements, and    -   X: integer of 2 or more        (18) The rolling bearing with a sensor as set forth in the above        (17), wherein the number of the caulking positions is prime.        (19) In a rolling bearing having at least an outer ring, an        inner ring, and rolling elements, any one of the outer ring and        the inner ring is a rotating ring, while the other is a        stationary ring,    -   a rolling bearing with a sensor, wherein an end face of a flat        magnet is multi-pole magnet, and is secured to the rotating        ring, and    -   a magnetically sensitive element is secured to the stationary        ring in opposition to the flat multi-pole magnetic face, leaving        spaces equidistantly in an axial direction of the bearing.        (20) The rolling bearing with a sensor as set forth in the        above (14) or (19), wherein the member of attaching the magnet        to the rotating ring extends toward the stationary ring so as to        close a vacancy of the bearing between the rotating ring and the        stationary ring.        (21) The rolling bearing with a sensor as set forth in the above        (20), wherein the inner ring is the rotating ring, and the        magnet attaching member is secured to a step portion in the        inner circumference of the inner ring.

In accordance with the sensor-bearing apparatus mentioned in the above(1), if the projection provided in the sensor cover contacts theinterior of the cutout of the presser member while the rolling bearingrotates, the movement in the rotating direction is checked. Then, incompany with the rotation of rotary-side bearing ring of the rollingbearing, the rotation of the sensor cover and the rotary-side bearingring integral with the sensor cover can be checked. Accordingly, by theabove sensor-bearing apparatus, even if the stationary-side bearing ringof the rolling bearing is generated with the rotating force, it ispossible to exactly check the rotation of the stationary-side bearingring, and the productivity is not reduced because the structure issimple.

In accordance with the sensor-bearing apparatus mentioned in the above(2), the signal wire of the sensor inserted in the opening of the sensorcover is not effected with the shearing force by contacting the interiorof the cutout, and the signal wire is exactly avoided from breaking ofthe wire. If the structure is to fix the signal wire inserted in theprojection by adhesion, welding, or a resin molding, a drawing strengthof the signal wire can be heightened, and the wire can be avoided frombreaking when a tensile load is increased.

In accordance with the sensor-bearing apparatus mentioned in the above(3), it is possible to curtail the number of parts, the setting-upprocess, and lower costs.

In accordance with the sensor-bearing apparatus mentioned in the above(4), the sensor is secured in the sensor attaching groove formed in thesensor holder in that the tightening margin is effected with an elasticdeformation of the sensor holder. Therefore, neither insertion of theresin nor use of an adhesive are requisite, and accordingly, thepositioning is realized easily and at high precision.

In accordance with the sensor-bearing apparatus mentioned in the above(5), it is possible to avoid the sensor cover from deformation caused byexpansion and shrinkage of the sensor holder owing to temperaturechange, so that it is possible to avoid dropping of the sensor coverfrom the stationary-side bearing ring (for example, the outer ring) ordeformation of the stationary-side bearing ring.

In accordance with the sensor-bearing apparatus mentioned in the above(6), when inserting the respective positioning pins in the respectivelycorresponding fitting holes, the sensor cover and the sensor holder canbe positioned at high precision without requiring the complicatedprocess such as the resin inserting formation.

In accordance with the sensor-bearing apparatus mentioned in the above(7), the positioning pins can be prevented from dropping from thefitting holes, depending on plastic-deformed parts. Accordingly, theabove mentioned sensor-bearing apparatus can exactly prevent the sensorfrom dropping or dislocation even if applying the external force asvibration.

Herein, as actual examples of the plastic deformation, there are listedthermal deformation by heating, laser deposit, or supersonic welding.

In accordance with the sensor-bearing apparatus mentioned in the above(8), the holding pressure is kept high around the circumferences of therespective fitting holes, and the function of the positioning pin isheightened.

In accordance with the sensor-bearing apparatus mentioned in the above(9), the sensor cover and the sensor holder are positioned, and at thesame time, the positioning pins are passed into the through-holes formedin the circuit substrate, so that the circuit substrate is positionedand supported at high precision between the sensor cover and the sensorholder.

This is such a structure where the sensor cover and the sensor holder orthe circuit substrate are engaged only at the projection of thecircumferential part of the fitting hole. Therefore, it is possible tolimit the part of mutually contacting the circuit substrate and thesensor cover to, e.g., another part than a circuit of the circuitsubstrate. Thus, a short circuit by contact between the circuit of thecircuit substrate and the sensor cover can be avoided certainly.

In accordance with the sensor-bearing apparatus mentioned in the above(10), the sensor is shielded from electromagnet by a conductive memberhaving an electromagnetic shielding effect, which is provided so as tocover at least one part of the sensor holding member. Therefore, theflow of the leakage magnetic flux from the outside is effectivelybypassed (detour) by the electromagnetic shield depending on theconductive member.

Further, the sensor-bearing apparatus according to the invention doesnot necessitate the sensor case fixing ring 804 or 861, the magneticby-path 805, or the side plate 863 as the sensor-bearing apparatus 800or the sensor-rolling bearing 850 shown in FIGS. 30 and 31.

Accordingly, the number of parts may be curtailed, and the setting-upprocess may be reduced.

In accordance with the sensor-bearing apparatus mentioned in the above(11), the sensor cover includes the conductive member having theelectromagnetic shielding effect. Therefore, the flow of the leakagemagnetic flux from the outside is effectively bypassed (detour) by theelectromagnetic shield depending on the conductive member. In addition,the number of parts may be further curtailed, and the setting-up processmay be reduced.

In accordance with the sensor-bearing apparatus and the sensor-rollingbearing mentioned in the above (12), the conductive member may beprovided to the sensor holder at higher strength, and concurrently thenumber of parts may be further curtailed, and the setting-up process maybe reduced.

As a method of integrally forming the conductive member and the sensorholder, there are a 2-color molding of a conductive resin, adhesion orpressing into fixture. The conductive member includes iron powder,magnetic powder, resin or rubber mixed with carbon black, paint oradhesive.

In accordance with the sensor-rolling bearing mentioned in the above(13), the attaching member being the magnetic substance functions as themagnetic shield to the external magnetic field, and reduces influencesof the external magnetic field to the magnetic part to be detected andto the magnet sensitive sensor. Therefore, it is possible to heightenthe detecting precision of the magnet sensitive sensor, and perform theexact measure.

In accordance with the sensor-rolling bearing mentioned in the above(14), being exposed to an intensively magnetic environment, the capacityin the magnetic part to be detected is not spoiled, and the speed ofrotation can be exactly detected. By the way, the magnetic materials ofthe rare earth may list neodymium-iron-boron (Nd—Fe—B), orsamarium-cobalt (Sm—Co), and the forming method may depend on any ofsintering, compression molding, or injection molding, but desirablyneodymium, iron, or boron materials are good because of being large in amaximum energy storage and durable to the external magnetic field, andamong them a bond magnet is better because of having excellent strength.Of the bond magnets, desirable are such magnetic materials of the largeenergy storage and by the compression molding.

In accordance with the sensor-rolling bearing mentioned in the above(15), it is unnecessary to provide such as the step portion difficult topass the precise process, and possible to accurately furnish themagnetically sensitive sensor and the member to be detected in the innerring and the outer ring.

In accordance with the sensor-rolling bearing mentioned in the above(16), the accuracy of attaching the sensor by means of the attachingmembers can be improved.

In accordance with the sensor-rolling bearing mentioned in the above(17) or (18), abnormal noises or vibrations probably generated in thebearing may be reduced.

In accordance with the sensor-rolling bearing mentioned in the above(19), since the magnetically sensitive elements are arranged inopposition one another, leaving spaces in the axial direction in thebearing by using the magnets having multi-poles in plane, thickness inthe axial direction of the whole of the sensor-bearing.

In accordance with the sensor-rolling bearing mentioned in the above(20), even in case the seal is not especially equipped in the bearingspace between the rotary rings, the grease in the bearing space can beprevented from flowing out outside from the bearing. Further, by makingthe magnet attaching member of a magnetic member, if an intensivelymagnetic field generating part exists around the environment, theleakage magnetic flux from the rolling elements can be avoided fromgoing toward the magnetically sensitive elements such as the magnet orthe hole IC. As a result, there is no miss-count of the speed pulseowing to erroneous action of the magnetically sensitive element, so thatthe pulse measuring accuracy can be heightened. Besides, since themagnet attaching member can be used as the shielding member of themagnetic flux, other parts are unnecessary, enabling to cost down.

In accordance with the sensor-rolling bearing mentioned in the above(21), the seal used in the existing bearing can be served as it is, andthe runoff of the grease can be reduced to the standard bearing.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a cross sectional view of the element parts, showing thesensor-bearing apparatus as a first embodiment of the invention;

FIG. 2 is a perspective view showing the sensor cover of thesensor-bearing apparatus of FIG. 1;

FIG. 3 is a cross sectional view showing the element parts secured tothe bearing housing of the sensor-bearing apparatus of FIG. 1;

FIG. 4 is a right side view of FIG. 3;

FIG. 5 is a view showing the presser member of the sensor-bearingapparatus of FIG. 1;

FIG. 6 is a perspective view showing the sensor cover of thesensor-bearing apparatus as a second embodiment of the invention;

FIG. 7 is a perspective view showing the sensor cover of thesensor-bearing apparatus as a third embodiment of the invention;

FIG. 8 is a perspective view showing the sensor cover of thesensor-bearing apparatus as a fourth embodiment of the invention;

FIG. 9 is a cross sectional view showing the sensor-bearing apparatus asa fifth embodiment of the invention;

FIG. 10 is an enlarged cross sectional view of the element parts of thesensor-bearing apparatus of FIG. 9;

FIG. 11 is disassembled views showing the sensor cover, the sensorholder and the circuit substrate of the sensor-bearing apparatus of FIG.9;

FIG. 12 is an enlarged perspective view showing the element parts aroundthe sensor attaching groove of the sensor holder;

FIG. 13 is a whole cross sectional view showing the sensor-bearingapparatus as a sixth embodiment of the invention;

FIG. 14 is a whole cross sectional view showing the sensor-bearingapparatus as a seventh embodiment of the invention;

FIG. 15 is a cross sectional view showing the sensor-rolling bearing asan eighth embodiment of the invention;

FIG. 16 is views showing the caulking method of the sensor holder;

FIG. 17 is a cross sectional view showing the magnetically sensitivesensor and the sensor positioning members;

FIG. 18 is a cross sectional view showing a structure of the magnet;

FIG. 19 is a cross sectional view showing the sensor-rolling bearing asa ninth embodiment of the invention;

FIG. 20 is a cross sectional view showing the sensor-rolling bearing asa tenth embodiment of the invention;

FIG. 21 is a cross sectional view showing the sensor-rolling bearing asan eleventh embodiment of the invention;

FIG. 22 is a partially cross sectional view showing the sensor-rollingbearing as a twelfth embodiment of the invention;

FIG. 23 is a front view showing the whirl-stopping structure of theconventional rotation sensor-bearing;

FIG. 24 is a cross-sectional view of the whirl-stopping structure ofFIG. 23;

FIG. 25 is a cross sectional view showing the conventionalsensor-bearing apparatus;

FIG. 26 is a cross sectional view along C-C line of the sensor-bearingapparatus of FIG. 25;

FIG. 27 is a cross sectional view of the element parts showing theconventional sensor-rolling bearing;

FIG. 28 is a whole cross sectional view showing another example of theconventional sensor-rolling bearing;

FIG. 29 is a whole cross sectional view of the element parts showing afurther example of the conventional sensor-rolling bearing;

FIG. 30 is a whole cross sectional view of the element parts showinganother example of the conventional sensor-bearing apparatus;

FIG. 31 is a cross sectional view of the element parts showing anotherexample of the conventional sensor-bearing apparatus; and

FIG. 32 is a partially plan view of FIG. 31.

BEST MODE FOR CARRYING OUT THE INVENTION

The following description will explain in detail embodiments of thesensor-bearing apparatus and sensor-rolling bearing with reference tothe attached drawings. By the way, the sensor-bearing apparatus and thesensor-rolling bearing according to the invention are not limited tothese embodiments.

First Embodiment

FIG. 1 is the cross sectional view of the element parts, showing thefirst embodiment of the sensor-bearing apparatus depending on theinvention. FIG. 2 is the perspective view showing the sensor cover ofthe sensor-bearing apparatus of FIG. 1. FIG. 3 is the cross sectionalview of the element parts showing the sensor-bearing apparatus havingthe rolling bearing of FIG. 1 secured to the bearing housing. FIG. 4 isa right side view of FIG. 3. FIG. 5 is a view showing the presser memberof the sensor-bearing apparatus of FIG. 3.

As showing in FIG. 1, the sensor-bearing apparatus 1 is furnished withthe rolling bearing 10. The rolling bearing 10 has the inner ring 12 asthe rotary-side bearing ring, the outer ring 13 as the stationary-sidebearing ring, and a plurality of rolling elements 11 rotatablyinterposed between the inner ring 12 and the outer ring 13. The pluralrolling elements 11 are held by a holder (not shown) to be equidistantin a circumferential direction.

The sensor-bearing apparatus 1 has the sensor 20 enabling to detectconditions of the rolling bearing 10.

The sensor 20 has the sensor holder 21, a sensor body 22 supported bythe sensor holder 21, the circuit substrate 23, a multi-polar magnet(encoder) 25 secured in the inner ring (the bearing ring at the movableside) though a bracket 24, and the sensor cover 26.

The multi-polar magnet 25 rotates together with the inner ring 12. Thesensor body 22 comprises a hole IC for detecting position, enabling todetect movement in rotating direction of the multi-polar magnet 25 and ahole IC for detecting the rotation speed. In the circuit substrate 23,an electronic circuit is mounted for processing detected signals by thesensor body 22.

As showing in FIGS. 1 and 2, the sensor cover 26 is formed by a sheetmetal working, and includes a ring shaped part 26 a receiving the sensorinward, a flange part 26 b provided at one end side in the axialdirection (a left side of FIG. 2), and a side face part 26 c provided atthe other end side in the axial direction (a right side of FIG. 2).

The sensor cover 26 is fixed by forcing to fit the flange part 26 b onthe outer circumference of the outer ring 13 of the rolling bearing 10.

In a determined position in the ring shaped part 26 a of the sensorcover 26, an opening 28 is defined. The opening 28 is provided at itsperipheral parts with a pair of projections 26 d standing in adiametrical direction, which are respectively made by being bent todiametrically project a slash formed in one part of the ring shaped part26 a of the sensor cover 26. In the instant embodiment, the pair ofprojections are bent as double-leafed hinged doors.

The circuit substrate 23 is closely attached to an inside (the side ofthe rolling bearing 10) of a side face 26 c of the sensor cover 26. Inthe opening 28, an input-output signal wire 27 connected to the circuitsubstrate 23 passes.

As showing in FIG. 3, in the sensor-bearing apparatus 1, the rollingbearing 10 is attached to the bearing housing 4 by means of the pressermember 2 and bolts 3. The sensor 20 is positioned at one end face sidein the axial direction (right end face side in FIG. 3) in the rollingbearing 10.

As showing in FIGS. 4 and 5, the presser member 2 is shaped in ring, andformed with a portion cut out (called as “cutout” hereafter) having aspace in a circumferential direction. The cutout 2 a is formed such thatthe width in, the circumferential direction is slightly larger than thewidth in the circumferential direction of the projection 26 d.

The sensor-bearing apparatus 1 is structured such that the pair ofprojections 26 d of the sensor cover 26 are positioned inside of thecutout 2 a of the presser member 2. Therefore, with respect to thesensor-bearing apparatus 1, the outer ring 13 of the rolling bearing 10is secured to the bearing housing 4 without interfering with theinput-output signal wire 27.

Further, if one of circumferential edges of the projections 26 dcontacts an inner wall of the cutout 2 a, the sensor cover 26 is held bythe presser member 2 as being impossible to rotate. In other words, thesensor cover 26 is checked from rotating together with rotation of theinner ring 12 as the rotary-side bearing ring, whereby the outer ring 13secured with this sensor cover 26 is similarly checked from rotation.

It is also sufficient that the signal wire fixing resin 29 is filledbetween the mutual projections 26 d, so that the input-output signalwire 27 of the sensor 20 inserted in the opening 28 is fixed to thesensor cover 26 by means of the signal wire fixing resin 29. Thereby,the drawing strength of the input-output signal wire 27 from the sensorcover 26 is heightened, and the breaking of wire can be exactly avoidedeven if a tensile load is effected to the input-output signal wire 27.

A structure of fixing the input-output signal wire 27 to the projections27 may depend on adhesion or welding, not depending on the abovementioned resin mold. Besides, such structures are also enough which fitthe input-output signal wire 27 in the projections 26 d, or whichplastic-deform the projections 26 d to keep the input-output signal wire27 therebetween.

According to the sensor-bearing apparatus 1 of the present embodiment,while the rolling bearing 10 rotates, the projections 26 d provided inthe sensor cover 26 contact the inside of the cutout 2 a of the pressermember 2, thereby to check the movement in the rotating direction. Then,in company with the rotation of the inner ring 12 as the rotary-sidebearing ring of the rolling bearing 10, the sensor cover 26 and theouter ring (the stationary-side bearing ring) 13 as one body of thissensor cover 26 are checked from rotation. Therefore, depending on theabove mentioned sensor-bearing apparatus 1, if the rotating force isgenerated in the outer ring 13 of the rolling bearing 10, the rotationof the outer ring 13 can be certainly stopped.

Accordingly, the input-output signal wire 27 of the sensor 20 insertedin the opening 28 of the sensor cover 26 is never acted with shearingforce or tensile load, whereby breaking of the wire of the input-outputsignal wire 27 is certainly avoided, and reliability or life of thesensor 20 are increased.

Further, since the rotation of the outer ring 13 can be checked, acreeping phenomenon of the outer ring 13, and the reliability or life ofthe rolling bearing 10 are heightened.

With the structure of the projections 26 d as mentioned above, neitherextra groove nor cutout are necessary for checking the rotation of theouter ring 13, so that rigidity of the rolling bearing 10 can be avoidedfrom declining. In addition, a new whirl-stop member covering theinput-output signal wire is not installed, and the number of productionprocess can be lessened.

In the following descriptions, modifications in shapes of theprojections will be explained referring to the second embodiment to thefourth embodiment.

Second Embodiment

FIG. 6 is the perspective view for explaining the second embodiment ofthe sensor-bearing apparatus according to the invention. Incidentally,in the embodiments to be explained under, as to members havingequivalent structures or works to those of the members already referredto, explanations will be simplified or omitted by giving the same orcorresponding numerals or marks.

In this embodiment, the projection 31 of the sensor cover 30 isstructured to be a single-leafed hinged door by so bending a cutout partformed in a part of the sensor cover 30 as to project in the diameterdirection.

Other structures and works are the same as those of the firstembodiment.

Third Embodiment

FIG. 7 is the perspective view showing the sensor cover of the rollingbearing of the sensor-bearing apparatus as the third embodiment of theinvention.

In this embodiment, the projection 41 of the sensor cover 40 isstructured to be a single-leafed hinged door by so bending the cutoutpart formed in a part of the sensor cover 40 as to project in thediameter direction, in opposition to the second embodiment in the axialdirection (the side face 40 c).

Other structures and works are the same as those of the firstembodiment.

Fourth Embodiment

FIG. 8 is the perspective view showing the sensor cover of the rollingbearing of the sensor-bearing apparatus as the fourth embodiment of theinvention.

In this embodiment, the sensor cover 50 is provided with a pair ofprojections 51 by bending the cutout slashed in a part of the sensorcover 51 in the circumferential direction in a manner of thedouble-leafed hinged doors.

Other structures and works are the same as those of the first embodimentto the third embodiment.

By the way, also in this embodiment, similarly to the second embodimentor the third embodiment, the projection may be structured as thesingle-leafed hinged door in the circumferential direction of the sensorcover.

As mentioned above, in the second to fourth embodiments, the sensorcovers 30, 40, 50 are structured in that the projections 31, 41, 51standing on the ring parts 30 a, 40 a, 50 a are disposed inside of thecutout 2 a of the presser member 2 shown in FIGS. 4 and 5. In suchmanners, the projections 31, 41, 51 are held by the presser member 2 todisable to rotate, and even if the rotating force of the outer ring 13acts on, the outer ring 13 and the sensor cover 26 can be checked fromrotation accompanied with the rotation of the inner ring 12.

A necessary and enough rotation checking function of the outer ring 13(the stationary-side bearing ring) can be secured and at the same timethe high productivity can be maintained without requiring such as thewhirl-stop member 107 as the conventional art (see FIGS. 23 and 24).Thereby, it is possible to curtail the number of parts, the setting-upprocess, and to lower costs.

The sensor-bearing apparatus of the second embodiment to the fourthembodiment can surely stop the rotation of the outer ring 13, enablingto protect load as the shearing force acting on the input-output signalwire 27 of the sensor 20 inserted in the openings 32, 42, 52 of thesensor covers 30, 40, 50, so that the breaking of the wire of theinput-output signal wire 27 can be certainly avoided, and thereliability and the durability of the sensor 20 can be improved.

In addition, the creep phenomenon of the outer ring 13 can be preventedto heighten the reliability and the durability of the rolling bearing10.

Neither extra groove nor cutout are necessary to provide in the outerring 13 for checking the rotation of the outer ring 13, so that rigidityof the rolling bearing 10 can be avoided from declining.

For example, this embodiment can be applied to such a sensor-bearingapparatus where the inner ring is the stationary-side bearing ring,while the outer ring is rotary-side bearing ring.

Fifth Embodiment

FIG. 9 is the cross sectional view showing the sensor-bearing apparatusas the fifth embodiment of the invention; FIG. 10 is the enlarged crosssectional view of the element parts of the sensor-bearing apparatus ofFIG. 9; FIG. 11 is the disassembled views showing the sensor cover, thesensor holder and the circuit substrate of the sensor-bearing apparatusof FIG. 9; and FIG. 12 is the enlarged perspective view showing theelement parts around the sensor attaching groove of the sensor holder.

As shown in FIG. 9, in the sensor-bearing apparatus 110, the basicstructure of the rolling bearing 111 is similar to that of the firstembodiment shown in FIG. 1, and although omitting the explanation giventhe same numerals, the holder 14 not shown in FIG. 1 is shown in FIG. 9,and a plurality of rolling elements 11 are held by the holder 14equidistantly in the circumferential direction.

At one end face in the axial direction (the right end face in FIG. 9) ofthe rolling bearing 111, the sensor 120 is furnished.

The sensor 120 comprises the sensor body 122 supported by the ringshaped sensor holder 121, a later mentioned circuit substrate 123, andthe multi-polar magnets (encoders) 125 fixed to the inner ring (thebearing ring at the movable side) 12 via the core metal 124 of themagnetic material, and is housed in the sensor cover 126.

The multi-polar magnet 125 rotates together with the inner ring 12. Thesensor body 122 is provided with the two holes IC with a decided anglesuch that it is possible to detect the movement in the rotatingdirection and the number of rotation of the multi-polar magnet 125. Theangle of the two holes IC is preferably decided such that phases ofoutput wave are 90° at an electrical angle.

As seeing FIG. 10, the sensor cover 126 is formed by sheeting a metalsheet of, e.g., the magnetic material, and includes a ring shaped part126 a housing the sensor 120 inward, a flange part 126 b at one end sidein the axial direction (the left side in FIG. 10) of the ring shapedpart 126 a, and a side face 126 c at the other side in the axialdirection (the right side in FIG. 10). The sensor cover 126 is securedto the outer ring 13 by fitting the flange part 126 b on the outercircumference of the outer ring (the rolling bearing of the stationaryside) 13 of the rolling bearing 111.

The sensor holder 121 includes, e.g., a synthetic resin, having adecided elasticity, and is fitted inward of the sensor cover 126. Atthis time, the face of the outer diameter of the sensor holder 121 isfitted to the inner circumference of the sensor cover 126, leaving apredetermined space. The sensor holder 121 is, as shown in FIG. 12,defined in a decided position with a sensor attaching groove 121 a whichis provided with a step portion 121 c for limiting a place of the sensorbody 122 in the axial direction, and which is fitted (snappingengagement) with the sensor body 122 with a determined tightening marginowing to elastic deformation of the sensor holder 121. The sensor body122 is attached under such a condition fitted in a manner that a bottomface 122 b, a side face 122 c and an oblique face 122 d are engaged withthe respectively corresponding faces of the sensor attaching groove 121a. At this time, the sensor body 122 is attached such that a front end122 a slightly projects than an edge of the sensor attaching groove 121a of the sensor holder 121. Therefore, as shown in FIG. 9, since thesensor 122 approaches at the front end 122 a the side of the multi-polarmagnet 125, the detecting precision of the sensor 122 more goes up.

As shown in FIGS. 9 to 11, the sensor holder 121 is provided with aplurality of positioning pins 127 respectively projecting in the axialdirection with determined spaces in the circumferential direction. Thesensor cover 126 is provided with a plurality of fitting holes 126 d inthe circumferential direction with determined spaces. The respectivepositioning pins 127 pass through the corresponding fitting holes 126 d,thereby to position the sensor cover 126 and the sensor holder 121. Eachof the positioning pins 127 penetrated in the fitting holes 126 d iselastic-deformed at its front end (the right end in FIG. 10), wherebythe sensor cover 126 and the sensor holder 121 are fixed each other.

The front end of the positioning pin 127 is made a hemispherical shapehaving a plane portion 127 a by the plastic-deformation. Then, the planeportion 127 a is positioned slightly inward (the left side of FIG. 10)than the side part 126 c. As the actual examples of the plasticdeformation, there are listed thermal deformation by heating, laserdeposit, or supersonic welding.

The respective fitting holes 126 d are made in corresponding positionsto the respective positioning pins 127 in the sensor cover 126 along theaxial direction (left and right in FIG. 9). The circumferential edge ofthe fitting hole 126 d in the sensor cover 126 forms a projection 126 estanding toward the side of the sensor holder 121 (the left side of FIG.9). In the projection 126 e, the sensor cover 126 engages the sensorholder 121 or the circuit substrate 123 so as not to contact other partsthan the projection 126 e.

Referring to FIGS. 9 and 11, the circuit substrate 123 causes thepositioning pin 127 of the sensor holder 121 fitted in the hole 126 d ofthe sensor cover 126 to pass through a through-hole 123 a bored in acorresponding position, and is kept between the sensor cover 126 and thesensor holder 121. The circuit substrate 123 is mounted with anelectronic circuit (not shown) processed signals by the sensor body 122.The contacting position between the circuit substrate 123 and the sensorcover 126 is limited to a position other than the electronic circuit ofthe circuit substrate 123 by means of the projection 126 e formed in thecircumferential part of the fitting hole 126 d. This manner avoids ashort circuit caused by contacting the electronic circuit of the circuitsubstrate 123 and the sensor cover 126.

The work of the sensor-bearing apparatus of this embodiment will beexplained.

The sensor body 122 of the sensor 120 is fitted in the sensor attachinggroove 121 a formed in the determined position along the circumferentialdirection in the sensor holder 121 with the decided tightening margin incompany with the elastic deformation of the sensor holder 121, and ispositioned easily and at high precision. The sensor holder 121 is fittedinward of the sensor cover 126 with the determined space.

The positioning pins 127 of the sensor holder 121 are inserted in thecorresponding fitting holes 126 d of the sensor cover 126, and thesensor cover 126 and the sensor holder 121 are positioned at highprecision without requiring the complicated process as the insertingformation.

Further, the positioning pins 127 of the sensor holder 121 pass throughthe fitting holes 126 d under the condition of inserting the positioningpins 127 in the fitting holes 126 d, and the inserted positioning pin127 is plastic-deformed at the front end. Accordingly, in case anexternal force as the vibration is effected, the sensor body 122 iscertainly prevented from dropping or dislocation.

The positioning pin 127 of the sensor holder 121 passes through thethrough-hole 123 a defined in the position corresponding to the circuitsubstrate 123, and is inserted in the fitting hole 126 d correspondingto the sensor cover 126. Thus, the circuit substrate 123 is positionedat high precision between the sensor cover 126 and the sensor holder121, and is held.

The circumferential parts of the respective fitting holes 126 d in thesensor cover 126 form the projections 126 e standing toward the side ofthe sensor holder 121, and the only projections 126 e engage the sensorcover 126 and the sensor holder 121 or the circuit substrate 123. Thecontacting position between the sensor cover 126 and the circuitsubstrate 123 is limited to the position other than the electroniccircuit of the circuit substrate 123. This manner exactly avoids theshort circuit caused by contacting the electronic circuit of the circuitsubstrate 123 and the sensor cover 126.

In the sensor-bearing apparatus 110 of this embodiment, the sensor body122 of the sensor 120 is fitted in the sensor attaching groove 121 adefined in the determined position along the circumferential directionin the sensor holder 121 owing to the elastic deformation of the sensorholder 121 with the decided tightening margin. Therefore, the sensorbody 122 can be positioned easily and at high precision withoutrequiring the complicated process as the insert form, whereby it ispossible to provide, at lower costs, the sensor-bearing apparatus 110having the highly detecting precision.

Sixth Embodiment

FIG. 13 is the whole cross sectional view showing the sensor-bearingapparatus as a sixth embodiment of the invention.

As shown in FIG. 13, in the sensor-bearing apparatus 210, the rollingbearing 211 is provided with magnetically sensitive sensor 220 at oneside in the axial direction (the right side of the same). The basicstructures of the rolling bearing 211 and the magnetically sensitivesensor 220 are similar to those of the fifth embodiment shown in FIG. 9except parts to be mentioned in detail in the following, and theexplanation is omitted by giving the same numerals.

In the magnetically sensitive sensor 220, the conductive member 228having the electromagnetic shielding effect is formed as one body withthe sensor holder 121 in the inner circumference of the sensor holder121. The conductive member 228 covers the inner circumference of thesensor holder 121, and shields electromagnet acting in the directionfrom the inner diametrical side of the bearing to the sensor body 122.

As practical methods of integrally forming the sensor holder 121 and theconductive member 228, there are a 2-color molding of a conductiveresin, adhesion or pressing into fixture. The conductive member 282includes iron powder, magnetic powder, resin mixed with carbon blackrubber, paint or adhesive.

The magnetically sensitive sensor 220 may be structured to have theposition detecting hole IC and the rotation number detecting hole IC,instead of furnishing the two holes IC with the determined angle.

In the sensor-bearing apparatus 210 of this embodiment, the bearinginner diametrical side of the sensor body 122 is shielded from theelectromagnet by means of the conductive member 228 having theelectromagnetic shielding effect The multi-polar magnet (the encoder)125 is disposed between the sensor body 122 and the sensor holder 121.

In the conventional sensor-bearing apparatus or sensor-rolling bearing(see FIGS. 30 and 31), in case of being attached to a motor (not shown),the magnetic field is generated, and the leakage magnetic flux flows outthrough the core metal→the multi-polar magnet→the sensor body→the sensorcover.

On the other hand, in the inventive sensor-bearing apparatus 210, theleakage magnetic flux directing from the bearing inner diametrical sideto the outer diametrical side is, as shown with arrows in FIG. 13,prevented from entering into the sensor cover 126 by the conductivemember 228, and detours along the surface of the sensor cover 126. Inshort, since the leakage magnetic flux does not flow into the sensorbody 122, the detecting signal influencing the leakage magnetic flux isnot issued.

Therefore, each of the sensor body 122 and the multi-polar magnet 125 isshielded by the conductive member 228 from the leakage magnetic fluxdirecting from the bearing inner diametrical side to the outerdiametrical side, and the leakage magnetic flux is effectively bypassed.Thus, the sensor-bearing apparatus 210 can avoid erroneous actions ofthe magnetically sensitive sensor 220.

Being disposed in order of the sensor body 122, the multi-polar magnet125, and the sensor cover 126 from the bearing inner diametrical side,even if the external leakage magnetic flux goes into the sensor part,the magnetic field reversely flows in the parts of the core metal126→the multi-polar magnet 125→the sensor body 122, and the magneticfield is difficult to flow, so that the majority of the invading leakagemagnetic flux is bypassed to other parts.

Seventh Embodiment

FIG. 14 is the whole cross sectional view showing the sensor-bearingapparatus as a seventh embodiment of the invention. By the way, in thefollowing embodiment, as to the members having the equivalent structuresor actuations to those of the members already mentioned, the explanationwill be simplified or omitted by giving the same or correspondingnumerals in the accompanied drawings.

As shown in FIG. 14, in the sensor-bearing apparatus 230 of the seventhembodiment, the sensor cover 231 is formed with a conductive member,instead of the conductive member (see FIG. 13) formed as one body withthe above mentioned sensor holder 121.

That is, the sensor cover 231 comprises an outer diametrically ringshaped portion 231 a enabling to house the magnetically sensitive sensor220 therein, a flange portion 231 b provided at one end side in theaxial direction (the left side in FIG. 14) of the outer diametricallyring shaped portion 231 a, a side face 231 c at the other end side inthe axial direction (the right side in the same) of the outerdiametrically ring shaped portion 231 a, and an inner diametrically ringshaped portion 231 d provided at the bearing inner diametrical side endof the side face 231 c. The sensor cover 231 is secured to the outerring 13 by mounting the flange part 231 b on the inner circumference 13b of the outer ring (the bearing ring of the stationary side) of thesensor-bearing apparatus 230.

The sensor cover 231 covers the outer whole of the sensor holder 232except the bearing side (the right side of FIG. 14) thereof forshielding the electromagnet of the magnetically sensitive sensor 220 tothe sensor body 122. In short, the sensor cover 231 has the function offixing the sensor body 122 to the outer ring 13 and bypassing theexternal leakage magnetic flux.

Herein, in the sensor-bearing apparatus 230, the leakage magnetic fluxdirecting from the bearing inner diametrical side to the outerdiametrical side is, as shown with arrows in FIG. 14, prevented fromentering into the sensor cover 231 by the inner diametrically ringshaped portion 231 d of the sensor cover (the conductive member) 231,and detours along the surface of the sensor cover 231. In short, sincethe leakage magnetic flux does not flow into the sensor body 122, thedetecting signal influencing the leakage magnetic flux is not issued.

Further, it is unnecessary to independently provide the sensor cover andthe conductive member, so that the number of parts and the setting-upprocess can be further curtailed.

Other structures and works are similar to those of the above mentionedsixth embodiment.

According to the sensor-bearing apparatus 230 of this embodiment, thesensor body 122 of the magnetically sensitive sensor 220 is shieldedfrom the electromagnet by means of the sensor cover 231 formed with theconductive member, and the multi-polar magnet 125 is disposed betweenthe sensor body 122 and the sensor holder 232.

Therefore, the external leakage magnetic flux can be effectivelybypassed by the less number of parts. Thus, the sensor-bearing apparatus230 can avoid erroneous actions of the magnetically sensitive sensor220.

Incidentally, the invention is not limited to the above mentionedembodiments, but appropriate deformations and improvement are available.

For example, for the above mentioned magnetically sensitive sensor 220,sensors of other types may be employed.

Eighth Embodiment

FIG. 15 is the cross sectional view showing the sensor-rolling bearingas an eighth embodiment of the invention. The basic structure of thesensor-rolling bearing 310 is similar to that of the fifth embodimentshown in FIG. 9 except parts to be mentioned in detail in the following,and the explanation is omitted by giving the same numerals.

Namely, in the sensor-rolling bearing 310, the seal 15 is expandedtoward the inner ring 12 in the vicinity of one side of the outer ring13, and the seal 15 covers the bearing space under the condition thatthe seal 15 contacts both of the inner ring 12 and the outer ring 13.The outer ring 13 is defined with a concave groove 16 in the end of theouter diametrical face thereof along the circumferential direction ofthe outer ring 13.

The sensor portion 330 of the sensor-rolling bearing 310 comprises thesensor cover 331 as the attaching member, the magnet holder 332 as theattaching member, the magnetically sensitive sensor 333, the magnet 334as a magnetic part to be detected, a spacer 335, the circuit substrate336, and the sensor positioning member 337.

The sensor cover 331 is the ring shaped magnetic member having arectangular shape viewed in cross section, and is secured in that oneend 331 a is caulked in the concave groove 16 formed in the outerdiametrical face 12 b of the outer ring 12.

FIGS. 16 (a) and (b) are views showing a method of caulking and securingone end 331 a of the sensor cover 331 in the concave groove 16 formed inthe outer diametrical face 12 b of the outer ring 12. Herein, in acaulker 400, caulking screws 401 are equidistantly provided in thecircumferential direction of the ring shaped sensor cover 331, that is,disposed in an equiangular arrangement in positions of nZ±X. The caulker400 forces to tighten the caulking screws 401, so that the front end 401a of the caulking screw 401 firmly secures one end 331 a of the sensorcover 331 into the concave groove 16. Herein, n is a positive integer, Zis the number of balls in the bearing, and X is the positive integer of2 or more. That is, the number of caulking positions is desirably prime.The sensor cover to be caulked and secured may employ such a sensorcover 340 equidistantly formed cutouts in one end as shown in FIG.16(c).

If the rolling bearing has waviness of comparatively large top height inthe bearings of the inner ring and the outer ring, abnormal noises areissued or the bearing is vibrated at constant frequency. In case thebearing of such waviness is mounted on a shaft, the shaft is subjectedto especial whirling movements undesirably in practice. Abnormal noisesor vibrations are generated when the number of waviness is nZ or nZ±X.

The caulking has probability of deforming the outer ring or the innerring of the bearing, and generating waviness of nZ or nZ±X. Accordingly,this embodiment specifies the number of caulking position to be nZ±X(X≧2) for preventing generation of vibration in order not to createwaviness of nZ or nZ±X.

The sensor cover 331 holds the magnetically sensitive sensors 33 at thedecided positions via the sensor positioning member 337 on the side faceof the inside end parts in rectangular shape in cross section. Themagnetically sensitive sensor 333 is connected to the circuit substrate336 disposed via the spacer 335 on the side face of the more inside inrectangular shape. The circuit substrate 336 is connected to a cablewire 338 for outputting outside from the sensor body 333.

On the other hand, the magnet holder 332 is the ring shaped magneticmember whose front ends are bent to face the front ends of the sensorcover 331. In this embodiment, the magnet holder 332 is forced to befixed in the outer diametrical end part 12 b of the inner ring 12. Themagnet holder 332 extends toward the side of the outer ring 13 to closethe bearing space from the inner ring 12, and functions as a covershielding the bearing space.

The magnet holder 332 holds the magnet 334 on the front end facing themagnetically sensitive sensor 333. With this arrangement, the sensorcover 331 and the magnet holder 332 hold the magnetically sensitivesensor 333 and the magnet 334 at the places not to expose the outside.Herein, the sensor cover 331 and the magnet holder 332 include themagnetic material, and therefore functions as the magnet shield not totransmit variations in the magnetic field caused by the magnetic noisesto the magnetically sensitive sensor 333 and the magnet 334. If using,as the material of the magnet 334, neodymium-iron-boron (Nd—Fe—B) orsamarium-cobalt (Sm—Co), resistance to the external magnetism is moreincreased.

FIG. 17 is the cross sectional view showing the magnetically sensitivesensor and the sensor positioning members. The sensor positioning member337 is the ring shaped member on the sensor cover 331. The sensorpositioning member is so disposed as to be concentric with the rotatingcenter of the shaft. The sensor positioning member 337 of thisembodiment is defined with three concaves 337 a for fixedly positioningthe magnetically sensitive sensor 333 in the outer diametrical face, andeach of the concaves 337 a is inserted with the magnetically sensitivesensor 333. In this embodiment, the magnetically sensitive sensors 333are disposed in the same circumference at the determined angular spacewith respect to the rotation center of the shaft.

The number of the magnetically sensitive sensors 333 to be attached canbe varied into arbitrary number in response to usage of thesensor-rolling bearing, while the number of the concaves 337 a to beformed in the sensor positioning member 337 is also varied intoarbitrary number in response to the number of the sensors. The structureof this embodiment is for detecting a phase angle of each phase of athree-phase motor, and for detecting the rotation speed of the shaft, atleast one sensor is enough, and for detecting the rotating direction atthe same time, two sensors are sufficient.

FIG. 18 is the cross sectional view showing the structure of the magnet334. The magnet 334 is fixed at the outer diametrical face to the magnetholder 332, and is opposite to the magnetically sensitive sensor 333 andthe sensor positioning member 337. In the embodiment, the magnet 334 isstructured in that eight pieces of N poles 334 a of the same shape andeight pieces of S poles 334 b are alternately connected in ring. Themagnet 334 is, similarly to the sensor positioning member 337, disposedto be concentric with the shaft rotating center, and rotates togetherwith the rotation of the inner ring 11. Being concentric with the sensorpositioning member 337, the distance between the magnet and themagnetically sensitive sensor 333 is not changed, irrespective of therotating position of the magnet 334. Each of N poles 334 a and S poles334 b is arranged such that the magnetic flux density is made strong inthe direction of the magnetically sensitive sensor 333.

The number of the magnetic poles of the magnet 334 is varied intoarbitrary number in response to using conditions of the sensor-rollingbearing 310 similarly to the number of the magnetically sensitive sensor333.

The magnetically sensitive sensor 333 rotates together with rotation ofthe shaft, detects intensity of the magnetic field formed by eachmagnetic pole of the magnet 334, and outputs it as an electric signal.The output electric signal is sent to the circuit substrate 336 throughthe signal wire, subjected to a predetermined process, and then outputthrough the signal wire 338 to a measuring device installed outside. Themeasuring device is based on the received electric signal to obtaininformation such as rotation speed, rotating direction and phase angleof the three phases.

The sensor-rolling bearing 310 of the eighth embodiment is secured inthat the sensor cover 331 holding the magnetically sensitive sensor 333caulks the plural positions in the concave groove 16 defined in theouter diametrical face of the outer ring 12. Further, the magnet holder332 holding the magnet 334 is forced to fix the end of the inner ring11. Therefore, it is possible to dispose the magnetically sensitivesensor 333 and the magnet 334 in the right position, without providingthe step portion of much dispersion in size.

The sensor cover 331 and the magnet holder 332 of a blank being themagnetic material shield the external magnetic field, so that no fearexists that variations of the external magnetic field give influences tothe magnetically sensitive sensor 333 and the magnet 334. Thus, theaccurate measure is possible not being affected by variations of theexternal magnetic field.

The magnet 334 is positioned at the outer diametrical side of themagnetically sensitive sensor 333, and the outer diametrical side of themagnet 334 is supported by the magnet holder 332. Therefore, the presentstructure avoids breakage of the magnet 334 by strong centrifugal forcegenerated when the shaft rotates at high speed.

Since the number of caulking positions is determined to be nZ±X (X≧2),it is possible to restrain occurrence of waviness of nZ or nZ±1 piece inthe raceway surface of the bearing owing to deformation by caulking.Therefore, it is possible to provide the sensor-rolling bearing of highprecision without issuing abnormal noises or vibrations.

The sensor-rolling bearing 310 of this embodiment may be applied as thebearing of the shaft used to automobiles, railway carriers, iron-makingfacilities, or machine tools for detecting rotation speed of shafts ofvarious devices.

Ninth Embodiment

FIG. 19 is the cross sectional view showing the sensor-rolling bearingas a ninth embodiment of the invention. The sensor-rolling bearing 350comprises the inner ring 351 mounted on the shaft, the outer ring 352fitted in the housing, balls 353 as the rolling elements rolling alongan inner ring raceway 351 a and an outer ring raceway 352 a respectivelyformed in the outer diametrical face of the inner ring 351 and in theinner diametrical face of the outer ring 352, a holder 354 holding theballs 353, and the shielding plate 355 standing from the vicinity of oneside of the outer ring 352 toward the inner ring 351 for covering thevacancy of the bearing defined between the inner ring 351 and the outerring 352. This embodiment defines a concave groove 351 b along thecircumferential direction of the inner ring 351 nearly one end of theouter diametrical face 351 b of the inner ring 351.

The sensor portion 360 of the sensor-rolling bearing 350 comprises thesensor cover 361 as the attaching member, the magnet holder 362 as theattaching member, the magnetically sensitive sensor 363, the magnet 364as the magnetic part to be detected, the spacer 365, the circuitsubstrate 366, and the sensor positioning member 367.

The sensor cover 361 is the ring shaped magnetic member of L-shape. Thesensor holder 361 has one end which is forced to be secured in theconcave groove 352 c formed along the circumferential direction on theinner diametrical face of the end 352 b of the outer ring 352. Thesensor cover 361 is provided at the L-shaped other end with the sensorpositioning member 367 in parallel in the axial direction. The sensorpositioning member 367 has the magnetically sensitive sensor 363 at thedecided part. The magnetically sensitive sensor 363 is connected to thecircuit substrate 366 disposed on the L-shaped inside face via thespacer 365. The circuit substrate 366 is connected to a cable wire 368for outputting outside from the sensor body 363.

On the other hand, the magnet holder 362 is the ring shaped magneticmember whose front ends are bent to face the front ends of the sensorcover 361. In this embodiment, one end 362 a of the magnet holder 362 iscaulked to be fixed in the concave groove 351 b formed in thecircumferential direction along the outer diametrical face of the innerring 351. This embodiment specifies the number of caulking positions tobe nZ±X (X≧2) for preventing generation of vibration. The magnet holder362 extends to the side of the outer ring 352 to close the bearing spacefrom the inner ring 351, and functions to shield the bearing space.

The magnet holder 362 holds the magnet 364 on the front end facing themagnetically sensitive sensor 363. With this arrangement, the sensorcover 361 and the magnet holder 362 hold the magnetically sensitivesensor 363 and the magnet 364 at the places not to expose the outside.Herein, the sensor cover 361 and the magnet holder 362 include themagnetic material, and therefore functions as the magnet shield not totransmit variations in the magnetic field caused by the magnetic noisesto the magnetically sensitive sensor 363 and the magnet 364.

The magnetically sensitive sensor 363 and the magnet 364 have thestructures equivalent to those of the magnetically sensitive sensor 333and the magnet 334 of the eighth embodiment.

The sensor-rolling bearing 350 of the ninth embodiment is secured inthat the sensor cover 361 holding the magnetically sensitive sensor 363is forced to be fixed in the end of the inner ring 351. Further, themagnet holder 362 holding the magnet 364 is fixed by caulking, in theplural positions, one ends 362 a in the concave groove 351 b formed inthe outer diametrical face of the inner ring 351. Therefore, it ispossible to dispose the magnetically sensitive sensor 363 and the magnet364 in the right position, without providing the step portion of muchdispersion in size.

The sensor cover 361 and the magnet holder 362 of a blank being themagnetic material shield the external magnetic field, so that no fearexists that variations of the external magnetic field give influences tothe magnetically sensitive sensor 333 and the magnet 364. Thus, theaccurate measure is possible not being affected by variations of theexternal magnetic field.

The magnet 364 is positioned at the outer diametrical side of themagnetically sensitive sensor 363, and the outer diametrical side of themagnet 334 is supported by the magnet holder 362. Therefore, the presentstructure avoids breakage of the magnet 364 by strong centrifugal forcegenerated when the shaft rotates at high speed.

Since the number of caulking positions is determined to be nZ±X (X≧2),it is possible to restrain occurrence of waviness of nZ or nZ±1 piecesin the raceway surface of the bearing owing to deformation by caulking.Therefore, it is possible to provide the sensor-rolling bearing 350 ofhigh precision without issuing abnormal noises or vibrations.

The sensor-rolling bearing 350 of this embodiment may be applied as thebearing of the shaft used to automobiles, railway carriers, iron-makingfacilities, or tool machines for detecting rotation speed of shafts ofvarious devices.

In addition, if the sensor cover 361 and the magnet holder 363 arerespectively caulked to be fixed to the inner ring 351 and the outerring 352, the same effect can be brought about.

Tenth Embodiment

The sensor-rolling bearing of the tenth embodiment according to theinvention is shown in FIG. 20. The basic structure of the rollingbearing 501 of the sensor-rolling bearing 500 is the same as that of thefifth embodiment shown in FIG. 9 except parts to be mentioned under indetail, and the explanation will be omitted by giving the same numerals.

Referring to FIG. 20, the holder 14 is a plastic-made crown, and a ringshaped shielding plate 15 is secured to a side opposite to a ringportion 14 a which is a closed side of the crown shaped holder 14, theplate 15 being mounted in the fitting groove 13 a of the outer ring 13,and non-contacted to the inner ring 12.

The core metal 124 as the magnet attaching member forms a cylindricalpart 517 bent in the axial direction of the bearing in the outercircumference, and the outer circumference 518 of the cylindrical part517 is opposite to an inner circumferential end 13 c of the outer ring13, leaving a slight space. The multi-polar magnet 523 in ring and planeshape is disposed as contacting the side face 521 of the core metal 124and the circumferential face 522 of the cylindrical part 517, and anadhesive is interposed at a part of contacting the multi-polar magnet523 to the side face 521 and the circumferential face 522, so that themulti-polar magnet 523 is firmly secured to the core metal 124. Themulti-polar magnet 523 has the magnetic poles as changing alternately inthe circumferential direction.

On the other hand, the step portion 524 of a ring shaped groove formedat the end part of the outer circumferential face 13 d of the outer ringis fixedly fitted with a fixing cylindrical part 526 of the sensor cover525 of the magnetic substance, while a step 527 formed in the sensorcover 525 contacts the side face of the outer ring 13 for positioning.The sensor cover 525 comprises a cylindrical holder 528 extending in theaxial direction of the bearing and a cylindrical holder 529 extendingfrom the front end of the cylindrical holder 528 toward the inside inthe radius direction, and a resin made base plate holder 530 is disposedas contacting the cylindrical holder 528 and cylindrical holder 529, andthe adhesive is interposed at their contacting part, so that the resinmade base plate holder 530 is fixedly adhered to the sensor cover 525.As the resin of forming the base plate holder 530, for example, 66 nylonincluding glass fiber, 44 nylon or PPS may be used.

The circuit substrate 531 is fixed to the face opposite to themulti-polar magnet 523 in the base plate holder 530, and on the circuitsubstrate 531, the hole IC 533 is soldered via a decided space from theside 532 of the multi-polar magnet 523. In the shown embodiment, thecircuit substrate 531 is appropriately soldered with various electricparts 534 such as a noise canceling resistor or a capacitor. In thesame, the base plate holder 530 is extended at one part to make a cabletaking-out portion 535. The cable taking-out portion 535 may be anindependent body, but it is desirable to make one body as abovementioned, since the number of parts is less. If mounting the electricparts such as the noise canceling resistor or the capacitor on thecircuit substrate 531, a sensor-bearing excellent in noise resistancemay be realized.

The hole IC 533 soldered on the circuit substrate 531 is sufficient witha lead type, but a hole IC of a surface mounting type may be used, whichis easy to solder and can attain a cost-down. Especially, in case ofmounting on the circuit substrate 531 various electronic parts as thenoise canceling resistor or the condenser other than the hole elements,if using the surface mounting typed resistor or condenser, all parts canbe soldered by one process, and more desirably the production may reducecost.

As the magnetically sensitive element, optional ones of theconventionally used magnet detecting elements such as hole elements, MRelements or MI elements other than the hole IC 533 may be selected andused.

In the above structure, since the outer circumferential face 518 of thecylindrical part 517 formed at the outer circumference of the core metal124 faces the inner circumferential face 13 c of the outer ring 13 witha slight space, is arranged to close the bearing space, and a grease inthe bearing space is difficult to leak away outside. If the core metal124 is made of the magnetic substance, the leakage magnetic flux passingthe rolling elements can be checked from going to the multi-polar magnet523 or the hole IC 533 owing to existence of the intensive magnetismoccurring part in the outside. As a result, any miss-count of the speedpulse by an erroneous operation of the hole IC 533 is absent, enablingto heighten the pulse measuring precision. In addition, since the coremetal 124 may be served as an interrupting member of the magnetic flux,other parts are unnecessary and the cost is reduced. If making thesensor cover 525 of the magnetic substance, an external magnetic fluxcan be interrupted by the sensor cover 525 of the magnetic substance.The magnetic flux of the multi-polar magnet 523 can be avoided fromleaking outside.

With the structure of forming the cylindrical part 517 at the outercircumference of the core metal 124 and arranging the multi-polar magnet523 inside of the cylindrical part 517, the positioning is preferablymade easy when attaching the multi-polar magnet 523. If filling theadhesive in the space to support the outer circumference of themulti-polar magnet 523 with the cylindrical part 517, the multi-polarmagnet 523 can be more preferably prevented from centrifugal breakdown.

As mentioned above, the multi-polar magnet 523 in plane shape is used,and the magnetically sensitive element such as the hole IC 533 isarranged, so that the thickness in the axial direction in the whole ofthe rolling bearing 501 can be reduced to be thin, and in particular themulti-polar magnet 523 can bear ranged at the part inherently providingthe seal for protecting the inside of the rolling bearing 501, and sinceat least either of both plane sides of the multi-polar magnet 523 can bedisposed inside than the end of the rolling bearing 501, the size in theaxial direction of the whole of the rolling bearing 501 can be furthershortened.

Incidentally, depending on shapes of the holder 14, the disposingposition in the bearing axial direction of the multi-polar magnet 523 isdetermined, and as shown in FIG. 20, employing the crown shaped plasticholder, if disposing the sensor in a side of opening the crown of theholder, the size in the axial direction can be more preferably reduced.

The core metal 124 desirably employs the magnetic substance forperforming magnetism interruption as mentioned later, an iron,martensite or ferrite based stainless steels are available. If using theiron as mentioned above, treatments as Zn or Ni plating or coating aredesirable.

As the structure of fixing the core metal 124 to the inner ring 12,other than that the inner circumferential end of the core metal 124 isfitted in the fitting groove 12 a defined in the inner circumferentialface of the inner ring 12, it is sufficient that the inner ring 12 ismade a flat face, not defining the groove, and a flange to be urged tothe flat face is formed in the core metal 124, and is attached byforcing to press.

Eleventh Embodiment

An eleventh embodiment of the invention is shown in FIG. 21. In theembodiment, a securing cylinder 542 of the core metal 541 as a magnetattaching member is fixedly fitted in the step portion 543 defined inthe inner circumferential face of the inner ring 12. The same shieldingplate 544 as the shielding plate 15 provided at the left side in thedrawing of the rolling element 11 is also provided at the right side inthe same of the rolling element 11. A point of arranging the hole IC 533soldered to the circuit substrate 531 supported by the sensor cover 525in such a manner that a determined space is formed in relation with theside face 532 of the multi-polar magnet 523 attached to the core metal541, is the same as in the tenth embodiment, and a detailed explanationis omitted.

In the sensor-rolling bearing of the eleventh embodiment shown in FIG.21, the core metal 541 is fixed to the inner circumferential face of theinner ring 12 as mentioned above, thereby to employ the structure ofproviding the shielding plates 15, 544 at the left and right of therolling element 11, so that the conventionally used bearing cover (thebearing shield) can be used as it is, and the protection of the bearinginside can be exactly performed, and concurrently the grease filled inthe interior can be checked from flowing outside.

Twelfth Embodiment

A twelfth embodiment is shown in FIG. 22. This embodiment uses acontacting rubber seal 546 as the bearing seal. The structures of themulti-polar magnet and the sensor are the same as in the eleventhembodiment shown in FIG. 21, and an explanation thereof is omitted.

In the sensor-rolling bearing of the twelfth embodiment shown in FIG.22, similarly to the eleventh embodiment shown in FIG. 21, since thecore metal 541 as the magnet attaching member is fixed to the stepportion 543 formed in the inner circumferential face of the inner ring12, the same sealing structure as that of the conventional bearing,whereby it is possible to employ the conventional sealing structureusing a rubber seal 546 having a good sealing performance, and toprovide the speed sensor, not largely projecting toward the side of thebearing.

In the sensor-rolling bearings of the eleventh and twelfth embodimentsshown in FIGS. 21 and 22, the size in the axial direction of the rollingbearing is longer in comparison with that of the sensor-rolling bearingof the tenth embodiment shown in FIG. 20, but it can be shortened thanthe conventional one, and particularly, since the inherent seal of therolling bearing can be served as it is, the sealing performance of therolling bearing is not spoiled.

In the sensor-rolling bearings of the tenth to twelfth embodiments, thecore metals 124, 541 as the magnet attaching member are arranged asclosing the bearing space, and even if the bearing seal is absent there,the grease can be prevented from leakage. The magnetic flux leaking tothe sides of the multi-polar magnet 523 or the hole IC 533 through therolling elements 11 can be interrupted by these core metals 124, 541,and erroneous operations when detecting the speed pulse can be madenaught.

As the core metals 124, 541, the magnetic substance is desirable forinterrupting the magnetism, and then, the iron, martensite or ferritebased stainless steels are available.

If using the iron as mentioned above, rust preventing treatments as Znor Ni plating or coating are desirable.

The eleventh and twelfth embodiments exemplify that the planemulti-polar magnet 523 is secured to the side of the inner ring 12 beingthe rotating ring, and in case the rotating ring is the outer ring 13,the multi-polar magnet 523 is attached to the outer ring 13 by the sametechnique as that of each embodiment using the core metal, so that theinvention can be applied similarly as mentioned above.

The present invention has been explained in detail, referring to thespecified embodiments, and it is apparent to those skilled in the art toadd modifications or revisions, not deviating the spirit and scope ofthe invention.

The present application is based on the Japanese Patent Applicationfiled Oct. 28, 2002 (No. 2002-312772), the Japanese Patent Applicationfiled Dec. 13, 2002 (No. 2002-362635), the Japanese Patent Applicationfiled Jan. 7, 2003 (No. 2003-001159), the Japanese Patent Applicationfiled Jan. 10, 2003 (No. 2003-004493), and the Japanese PatentApplication filed Aug. 27, 2003 (No. 2003-303736), and the contentsthereof are taken herein as reference.

INDUSTRIAL APPLICABILITY

In accordance with the sensor-bearing apparatus and the sensor-rollingbearing of the present invention, reduction in size, high productivityand cost curtailing effect can be realized, the sensor can be positionedeasily and a thigh precision, not requiring any complicated process asresin inserting formation, and further the leakage magnetic flux fromthe outside can be effectively bypassed, so that any erroneous operationof the sensor caused by electricity or magnetic noises of the motors canbe prevented.

1-21. (canceled)
 22. A bearing apparatus with a sensor, furnished with arolling bearing including in that a plurality of rolling elements areincorporated between a rotary-side bearing ring and a stationary-sidebearing ring, a sensor enabling to detect conditions of the rollingbearing, a ring shaped sensor cover housing the sensor inward andsecured to the stationary-side bearing ring, and a ring shaped pressermember secured to a bearing housing or a shaft provided outside in aradius direction of the sensor cover, wherein an opening is defined in adetermined position of the sensor cover, and is provided at itsperipheral part with projections standing toward the side of the pressermember, the presser member is formed with a cutout into which theprojections are inserted for restraining rotation of the sensor cover.23. The bearing apparatus with a sensor as set forth in claim 22,wherein a signal wire to be connected to the sensor is inserted in theopening.
 24. The bearing apparatus with a sensor as set forth in claim22, wherein the projections are made by being bent to project a slashformed in one part of the sensor cover in a diametrical direction. 25.In a rolling bearing structured in that a plurality of rolling elementsheld in a holder are rotatably incorporated between a pair of bearingrings, a bearing apparatus with a sensor, comprising a sensor fordetecting conditions of a supported rotating shaft or of the rollingbearing, a ring shaped sensor cover secured to one end face in an axialdirection of a stationary-side bearing ring, and a ring shaped sensorholding member secured to the sensor cover, wherein the sensor is fittedin a sensor holding groove provided in a determined position along acircumferential direction in the sensor holding member with a determinedtightening margin owing to elastic deformation of the sensor holdingmember.
 26. The bearing apparatus with a sensor as set forth in claim25, wherein the sensor holding member is fitted inward of the sensorcover with a determined space.
 27. The bearing apparatus with a sensoras set forth in claim 25, wherein the sensor holding member is formedwith a plurality of positioning pins as projecting respectively in theaxial direction, leaving determined spaces in the circumferentialdirection, and the sensor cover is formed with a plurality of fittingholes in respective positions corresponding to the plurality ofpositioning pins, and the plurality of positioning pins are fitted inthe plurality of respectively corresponding fitting holes, whereby thesensor cover and the sensor holding member are positioned.
 28. Thebearing apparatus with a sensor as set forth in claim 27, wherein theplurality of positioning pins are respectively inserted in the pluralityof fitting holes, and the plurality of positioning pins passing throughthe plurality of fitting holes are plastic-deformed at front ends,whereby the sensor cover and the sensor holding member are fixed. 29.The bearing apparatus with a sensor as set forth in claim 27, whereinthe plurality of fitting holes are formed in the circumference withprojections standing toward the sensor holding member, and the sensorcover and the sensor holding member are engaged by means of theprojections only.
 30. The bearing apparatus with a sensor as set forthin claim 27, wherein a circuit substrate of the sensor is held betweenthe sensor cover and the sensor holding member, and the plurality ofpositioning pins of the sensor holding member pass through holesprovided in the corresponding positions in the circuit substrate, andare inserted in the fitting holes.
 31. In a rolling bearing structuredin that a plurality of rolling elements held in a holder are rotatablyincorporated between a pair of bearing rings, a bearing apparatus with asensor, comprising a sensor for detecting conditions of a supportedrotating shaft or of a bearing, a ring shaped sensor cover of a magneticmaterial secured to one end face in an axial direction of astationary-side bearing ring, a ring shaped sensor holding member of anon-magnetic material holding the sensor inward under a condition ofbeing secured inward of the sensor cover, and a conductive memberinstalled as covering at least one part of the sensor holding member andhas an electromagnetic shield effect.
 32. In a rolling bearingstructured in that a plurality of rolling elements held in a holder arerotatably incorporated between a pair of bearing rings, a bearingapparatus with a sensor, comprising a sensor for detecting conditions ofa supported rotating shaft or of a bearing, a ring shaped sensor coverof a conductive member having an electromagnetic shielding effectsecured to one end face in an axial direction of a stationary-sidebearing ring, and a ring shaped sensor holding member of a non-magneticmaterial holding the sensor inward under a condition of being securedinward of the sensor cover.
 33. The bearing apparatus with a sensor orthe rolling bearing with a sensor as set forth in claim 31, wherein theconductive member is provided as one body with the sensor holdingmember.
 34. A rolling bearing with a sensor, comprising an inner ring,an outer ring, rolling elements interposed between the inner ring andthe outer ring, a magnetic part to be detected provided to one of theinner ring and the outer ring, and a magnetically sensitive sensorprovided to the other of the inner ring and the outer ring and beingopposite to the magnetic part to be detected, wherein any one of themagnetic part to be detected and the magnetically sensitive sensor issecured to the inner ring or the outer ring via an attaching member of amagnetic substance.
 35. The rolling bearing with a sensor asset forth inclaim 34, wherein the magnetic part to be detected is a ring shapedmulti-pole magnet of rare earth.
 36. The rolling bearing with a sensoras set forth in claim 34, wherein the attaching member is fixedlycaulked in a concave groove formed in an outer diameter of the innerring or the outer diameter of the outer ring.
 37. The rolling bearingwith a sensor as set forth in claim 36, wherein the concave groove isformed in the circumference along the outer diameter of the inner ringor the outer diameter of the outer ring, and the attaching members arecaulked in a plurality of positions equidistantly along thecircumference.
 38. The rolling bearing with a sensor as set forth inclaim 37, wherein the number of the caulking positions follows the undermentioned formula,(the number of the caulking positions)=nZ±X herein, n: positive integerZ: the number of the rolling elements, and X: integer of 2 or more 39.The rolling bearing with a sensor as set forth in claim 38, wherein thenumber of the caulking positions is prime.
 40. In a rolling bearinghaving at least an outer ring, an inner ring, and rolling elements, anyone of the outer ring and the inner ring is a rotating ring, while theother is a stationary ring, a rolling bearing with a sensor, wherein anend face of a flat magnet is multi-pole magnet, and is secured to therotating ring, and a magnetically sensitive element is secured to thestationary ring in opposition to the flat multi-pole magnetic face,leaving spaces equidistantly in an axial direction of the bearing. 41.The rolling bearing with a sensor as set forth in claim 35, wherein themember of attaching the magnet to the rotating ring extends toward thestationary ring so as to close a vacancy of the bearing between therotating ring and the stationary ring.
 42. The rolling bearing with asensor as set forth in claim 41, wherein the inner ring is the rotatingring, and the magnet attaching member is secured to a step portion inthe inner circumference of the inner ring.
 43. The bearing apparatuswith a sensor or the rolling bearing with a sensor as set forth in claim32, wherein the conductive member is provided as one body with thesensor holding member.
 44. The rolling bearing with a sensor as setforth in claim 40, wherein the member of attaching the magnet to therotating ring extends toward the stationary ring so as to close avacancy of the bearing between the rotating ring and the stationaryring.
 45. The rolling bearing with a sensor as set forth in claim 44,wherein the inner ring is the rotating ring, and the magnet attachingmember is secured to a step portion in the inner circumference of theinner ring.